<template>
  <el-menu default-active="1-4-1"
           class="el-menu-vertical-demo"
           @open="handleOpen"
           @close="handleClose"
           :collapse="isCollapse"
           background-color="#545c64"
           text-color="#fff"
           active-text-color="#ffd04b">

    <h3>{{isCollapse ? '后台' : '后台管理系统'}}</h3>

    <el-menu-item v-for="item in noChildren"
                  :index="item.path"
                  :key="item.path"
                  @click="clickMenu(item)">
      <i :class="'el-icon-' + item.icon"></i>
      <span slot="title">{{item.label}}</span>
    </el-menu-item>

    <el-submenu v-for="item in hasChildren"
                :index="item.path + ''"
                :key="item.path">
      <template slot="title">
        <i :class="'el-icon-' + item.icon"></i>
        <span slot="title">{{item.label}}</span>
      </template>
      <el-menu-item-group v-for="subItem in item.children"
                          :key="subItem.path">
        <el-menu-item @click="clickMenu(subItem)"
                      :index="subItem.path + ''">{{subItem.label}}</el-menu-item>
      </el-menu-item-group>
    </el-submenu>

  </el-menu>
</template>

<script>
export default {
  name: 'CommonAside',
  data () {
    return {
      menu: [
        {
          path: '/',
          name: 'home',
          label: '首页',
          icon: 's-home',
          url: 'Home/Home'
        },
        {
          path: '/user',
          name: 'user',
          label: '用户管理',
          icon: 'user',
          url: 'UserManage/UserManage'
        },
        {
          label: '其他',
          icon: 'location',
          children: [
            {
              path: '/page1',
              name: 'page1',
              label: '页面1',
              icon: 'setting',
              url: 'Other/PageOne'
            },
            {
              path: '/page2',
              name: 'page2',
              label: '页面2',
              icon: 'setting',
              url: 'Other/PageTwo'
            }
          ]
        }
      ]
    }
  },
  methods: {
    handleOpen (key, keyPath) {
      console.log(key, keyPath);
    },
    handleClose (key, keyPath) {
      console.log(key, keyPath);
    },
    clickMenu (item) {
      this.$router.push({
        name: item.name
      })
      this.$store.commit('selectMenu', item)
    }
  },
  computed: {
    noChildren () {
      return this.asyncMenu.filter(item => !item.children)
    },
    hasChildren () {
      return this.asyncMenu.filter(item => item.children)
    },
    isCollapse () {
      return this.$store.state.tab.isCollapse
    },
    asyncMenu () {
      return this.$store.state.tab.menu
    }
  }
}
</script>

<style lang="less" scoped>
.el-menu-vertical-demo:not(.el-menu--collapse) {
  width: 200px;
  min-height: 400px;
}
.el-menu {
  height: 100%;
  border: none;
  h3 {
    color: #fff;
    text-align: center;
    line-height: 48px;
  }
}
</style>